437 results found
    1. Cell Biology
    2. Immunology and Inflammation

    Arp2/3 complex-driven spatial patterning of the BCR enhances immune synapse formation, BCR signaling and B cell activation

    Madison Bolger-Munro et al.
    Arp2/3 complex-mediated actin polymerization shapes how B lymphocytes probe the surface of antigen-presenting cells, promotes coalescence of B cell receptor (BCR) microclusters, amplifies BCR signaling, and enhances B cell activation.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Mechanism of synergistic activation of Arp2/3 complex by cortactin and N-WASP

    Luke A Helgeson, Brad J Nolen
    Single-molecule TIRF microscopy, biochemical assays and mathematical modeling demonstrate how actin-branch nucleation by the Arp2/3 complex is coordinately regulated by two biochemically distinct activators.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Three-color single molecule imaging shows WASP detachment from Arp2/3 complex triggers actin filament branch formation

    Benjamin A Smith et al.
    New insights into the mechanism responsible for the nucleation of branches on networks of actin filaments shed light on a process that is essential for eukaryotic cell motility and endocytosis.
    1. Biochemistry and Chemical Biology
    2. Cell Biology

    Synergy between Wsp1 and Dip1 may initiate assembly of endocytic actin networks

    Connor J Balzer et al.
    An activator of branching nucleation by Arp2/3 complex directly synergizes with an activator of linear filament nucleation to initiate assembly of actin networks that drive endocytosis.
    1. Structural Biology and Molecular Biophysics
    2. Microbiology and Infectious Disease

    Structural basis of HIV-1 Vpu-mediated BST2 antagonism via hijacking of the clathrin adaptor protein complex 1

    Xiaofei Jia et al.
    HIV-1 viral protein u (Vpu) can stimulate novel versions of canonical interactions with the clathrin adaptor AP1 to counteract the host antiviral protein BST2.
    1. Structural Biology and Molecular Biophysics
    2. Cell Biology

    9Å structure of the COPI coat reveals that the Arf1 GTPase occupies two contrasting molecular environments

    Svetlana O Dodonova et al.
    A molecular model of the assembled COPI coat, determined by cryo-electron tomography of an in vitro reconstituted budding reaction, reveals details of interactions mediating coat assembly and shows the binding site of ArfGAP2.
    1. Cell Biology

    Actin assembly ruptures the nuclear envelope by prying the lamina away from nuclear pores and nuclear membranes in starfish oocytes

    Natalia Wesolowska et al.
    Combined light and electron microscopy reveals a new function for Arp2/3-mediated actin assembly in nuclear envelope rupture, which leads to a separation of nuclear membranes and pores from the lamina.
    1. Biochemistry and Chemical Biology

    Talin-activated vinculin interacts with branched actin networks to initiate bundles

    Rajaa Boujemaa-Paterski et al.
    At adhesion sites, talin-activated vinculin promotes interactions with the actin network that initiates bundles.
    1. Cell Biology

    Direct comparison of clathrin-mediated endocytosis in budding and fission yeast reveals conserved and evolvable features

    Yidi Sun et al.
    Quantitative comparison of clathrin-mediated endocytosis in budding and fission yeast identified conserved mechanisms and species-specific adaptations with broad implications that extend from yeast to humans.
    1. Cell Biology

    Actin-based protrusions of migrating neutrophils are intrinsically lamellar and facilitate direction changes

    Lillian K Fritz-Laylin et al.
    Neutrophil pseudopods are composed of multiple sheets that are inherently flat, protrude in three dimensions, and whose assembly correlates with cell turning.

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